I use a Gerber Paraframe I to gut deer. They sharpen up easily, they are cheap (around $20 at WalMart) and they are easy to clean even though it is a folder.
http://www.gerbergear.com/Essentials...knife_22-48446
Buddy bought one of those Outdoor Edge Razor-Lite series knives. Used one blade to break down a 70 pound pig with no issues. I am getting ready to pick one up for myself
http://www.outdooredge.com/category-s/31.htm